I NEED HELP INSTALLING A SYSTEM IN MY GS 300. I DONT WANT TO GET AN AFTERMARKET DECK AND I ALSO DONT WANT TO CUT MY WIRES EITHER. I HEARD OF AN ADAPTER FOR THE RCA WIRES. IS THERE A SUCH THING AS A RCA ADAPTER?? AM I GUNA HAVE TO CUT MY WIRES? SOMEONE HELP ME.